What İs An Api
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1. API = “Application Programming Interface”
APIs are the plumbing of modern software. Every app you use — Slack, Spotify, Uber — is a pile of APIs talking to other APIs. Understanding them is maybe the single most important concept after learning to program.
2. What a web API looks like
This guide explains APIs in plain English, with enough detail to actually use them. No hand-waving.
3. HTTP methods in one breath
A contract that lets one program talk to another. You send a request, you get a response. The classic analogy: a restaurant menu. You don’t tell the kitchen how to cook — you order by name, they deliver.
4. Status codes matter
GET to read. POST to create. PUT/PATCH to update. DELETE to delete. That’s the entire REST alphabet. Different verbs, same URL structure — the verb tells the server what you want.
5. JSON is the lingua franca
2xx = success. 3xx = redirect. 4xx = you messed up (400 bad request, 401 auth missing, 404 not found). 5xx = they messed up (500 server error). Reading codes quickly is a debugging skill.
6. Authentication: API keys and tokens
Use curl, Postman, or Insomnia. Hit the endpoint, inspect the response. The docs lie sometimes — the real contract is what the server actually returns. Test before you build against it.
7. REST vs GraphQL vs RPC
Most APIs cap how many requests per minute you can make and page large result sets. Respect the limits, handle 429 responses, follow pagination links. Hitting rate limits in prod is a rookie mistake.
8. How to test an API
Normally you call them. With webhooks, they call you when something happens (new order, message, etc.). You give them a URL, they POST to it. Great for event-driven flows.
9. Rate limits and pagination
Good API docs make or break adoption. Stripe is the gold standard. When building your own API, the docs are as important as the code. Bad docs mean users give up.